Automatic chuck



May 29, 1923.

. R. REINERY AUTOMATIC cHUcK Filed NOV. 5, 1921 Inv-enter:

Rampe" tate in unison.A The head which causes the of the head g in which-they are heldv by Patented May 29, 1923.

' RUDOLFBEINERY, OFQKABEL, GERMANY.

E-'AraNrr AUTOMATIC CHUCK;

-Applicgation lvfiled November 5, v1921. Seria-I No?. 513311799.V

'2 .01 all'y whom it concern.'

Be it known: that I, RUDoLE RmNERYa citizen ofthe `German Republic, andal resident of Kabel W'.,Germany, have invented certain new and useful.Improvements in Automatic Chucks, ofY which the following scale,.on line8-48'of1-l*ig.';1'and1line-1-l of,

` My inventionrelates to vself-opening screvv-` ing chucksband more.particularly to chucks is a. description.

of the kind'described inwhich the chasers are secured to rockingholders.- f Chucks ofv this generalv description are'known: in the art.of cutting-metal and various means are employed for the automaticopening of the same. Generally, this is effected by a ring rotatablycarriedl on the body of the chuck to which rotation is imparted bymeans, such as conical pins, Wedges, cams, etc. The said means are incontact with each other only along a line or a very narrow surface and,besides, the cooperating parts do not move at the same velocity.Consequently, they will Wear excessively and the life of such chucks,particularly ofthe larger sizes, Will be very short.

I overcome this drawback by forming the contact surfaces of dogs securedto the head and operating ring of the chucks in the shape of steephelical faces.V The ring and head are connected by pins, so that theyWill roholders of the chasers to rock, is free to rotate on the chuckbody to a limited extent. An axial displacement of the ring in relationto the head of the chuck causes the said dogs to engage so that the headis rotated on the body of the chuck by the helical faces of the dogssliding alongeach other. This construction of the dogs effects a verysmooth operation of the chuck which is very accurate and practicallywithout Wear. The chuck is opened by means of U-shaped springs. Thechuck is of very simple yet very effective design.

In the drawings accompanying this specitication, a chuck embodying myinvention is illustrated by Way of example. In the drawings, i

Fig. l is an elevation, partly in section on line l-1 of Fig. 3, of myimproved chuck,

Fig. 2 is a section on line 2-2 of 1.* ig. 3,

Fig. 3 is a front end view of the chuck,

dogs,

Figs. 4, 5` and 6'V illustratevarious posi-v tions.` ofthe dogs for`operatingthehead of the chuck,

Fig. 7

Figs. 8 and9 are: sections, ony a larger slide on but partakesf in therotationqof, the,

body;A bfofthechuck. The` front end ofthe,

AFFI-zoe. y

. v` is. any end view of 'tivo cooperatingy body is of'smallerdiameterthanfthe. restof -the body and forms a bearingfforaizhead g' which isconnected With the ring a by pins The head .is free to rotate` on thebody b.

but isl held against axialmovement. A dog yc is secured to the body b bya screw o and a corresponding dog d is secured to the ring a by a screwel. The faces of said dogs are curved on a helical line s, as indicatedin Figs. 1 and 4. The inner surface of the ring a is recessed at v toeither side of the `dog d.` I may provide any nuniber'of such cooperatindogs on a chuck. l

' he chasers 7' are secured to holders L one of which is shown-in Fig.3. The holders h are pivotally carried on the body b by pins g. Slottedguides u are formed in their -free ends which are engaged by cross headssecured on pins t in the head g.

U-shaped springs c' are arranged in recesses pins lc. Facing the ends ofsaid springs are pins m and mf secured to the body In the position ofthe lring o; illustrated in Fig. l, the chuck is open. In order to closeit, that is, to move the chasers forward into their operative position,the ring a isl displaced axially on the body Z) until it en-` tion ofthe dogs before the ring a is displaced, Fig. .4 is an intermediateposition `and Fig. 6 the final position of the dog's'vvhen` the ring ais vengaging the ring g. As ythe dog c is iXed onthe bodyb, the ring awill be rotated While'it is being displaced axiallyl and the head g Willybe rotated with it 'by the pins f. This causes the holders L to .rockand to advance the chasers 1, Suppose CII the head g to have beenrotated in the direction of the arrow in Fig. 8. The sprinOr which moveswith the head g, will finally engagethe pin m so that it will be bent onfurther rotation as illustrated, While the opposite end ot thel springengages the opposite Wall i2 of its recess.

In order to open the chuck, the ring a is withdrawn and returned intothe position illustrated in Fig. l. The pressure of the spring orsprings a' will then cause the head g to rotate in opposite direction.The ring a will rotate with the head until the parts are in the initialposition of Fig. l.

It it be desired that the ring L and head should rotate in the oaaositedirection that is, `for instance, tothe left in big. l, a set screw nengaging a groove in one of the pins f, is Withdrawn and the ring a isrotated until the dog al is at the left of the dog c in F ig. lwhereupon the screw n is tightened. `When the ring a is nowl displaced,it will rotate to the left in Fig. l and the other pin, m', will engagethe end of the spring z' so that its opposite end will engagethe Wall jof its recess. f

I Wish it to be understood that I do not desire to be limited to theexact details of construction shown and described, as my invention maybe modified in Various Ways Without departing from its essentialfeatures.

I claim:

1. In a self opening chuck, in combination, a body, chaser holderspivoted to said body, a hea-d adapted to rotate on said body andoperatively connected with said chaser holders, a dog secured on saidbody and a dog operativelyconnected with said head and adapted toooperate with said dog on said body, the operating faces of said dogsbeing formed on helical curves.

2. vIn av self opening chuck, in combination, a lbody, chaser holderspivoted to said body, a head adapted to rotate on said body andoperatively connected with said chaser holders, means for rotating saidhead, a spring secured to said headl and a pin secured to said body andadapted to be engaged by said spring when the head is rotated in a givendirection.

In testimony Whereof'I afiix Iny signature. RUDOLF REINERY.

